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<div class="title">sgemm.cl</div>  </div>
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<a href="sgemm_8cl.html">Go to the documentation of this file.</a><div class="fragment"><div class="line"><a name="l00001"></a><span class="lineno">    1</span>&#160;<span class="comment">/*</span></div>
<div class="line"><a name="l00002"></a><span class="lineno">    2</span>&#160;<span class="comment"> * This confidential and proprietary software may be used only as</span></div>
<div class="line"><a name="l00003"></a><span class="lineno">    3</span>&#160;<span class="comment"> * authorised by a licensing agreement from ARM Limited</span></div>
<div class="line"><a name="l00004"></a><span class="lineno">    4</span>&#160;<span class="comment"> *    (C) COPYRIGHT 2013 ARM Limited</span></div>
<div class="line"><a name="l00005"></a><span class="lineno">    5</span>&#160;<span class="comment"> *        ALL RIGHTS RESERVED</span></div>
<div class="line"><a name="l00006"></a><span class="lineno">    6</span>&#160;<span class="comment"> * The entire notice above must be reproduced on all authorised</span></div>
<div class="line"><a name="l00007"></a><span class="lineno">    7</span>&#160;<span class="comment"> * copies and copies may only be made to the extent permitted</span></div>
<div class="line"><a name="l00008"></a><span class="lineno">    8</span>&#160;<span class="comment"> * by a licensing agreement from ARM Limited.</span></div>
<div class="line"><a name="l00009"></a><span class="lineno">    9</span>&#160;<span class="comment"> */</span></div>
<div class="line"><a name="l00010"></a><span class="lineno">   10</span>&#160;</div>
<div class="line"><a name="l00020"></a><span class="lineno"><a class="code" href="sgemm_8cl.html#abfe7be25d42e6bb53f76001bdbab6b25">   20</a></span>&#160;__kernel <span class="keywordtype">void</span> <a class="code" href="sgemm_8cl.html#abfe7be25d42e6bb53f76001bdbab6b25" title="SGEMM kernel function.">sgemm</a>(__global <span class="keywordtype">float</span>* restrict matrixA,</div>
<div class="line"><a name="l00021"></a><span class="lineno">   21</span>&#160;                    __global <span class="keywordtype">float</span>* restrict <span class="keyword">const</span> matrixB,</div>
<div class="line"><a name="l00022"></a><span class="lineno">   22</span>&#160;                    __global <span class="keywordtype">float</span>* restrict matrixC,</div>
<div class="line"><a name="l00023"></a><span class="lineno">   23</span>&#160;                    <span class="keyword">const</span> uint matrixOrder,</div>
<div class="line"><a name="l00024"></a><span class="lineno">   24</span>&#160;                    <span class="keyword">const</span> <span class="keywordtype">float</span> alpha,</div>
<div class="line"><a name="l00025"></a><span class="lineno">   25</span>&#160;                    <span class="keyword">const</span> <span class="keywordtype">float</span> beta)</div>
<div class="line"><a name="l00026"></a><span class="lineno">   26</span>&#160;{</div>
<div class="line"><a name="l00027"></a><span class="lineno">   27</span>&#160;    <span class="comment">/* [Kernel size] */</span></div>
<div class="line"><a name="l00028"></a><span class="lineno">   28</span>&#160;    <span class="keyword">const</span> <span class="keywordtype">int</span> i = get_global_id(1);</div>
<div class="line"><a name="l00029"></a><span class="lineno">   29</span>&#160;    <span class="keyword">const</span> <span class="keywordtype">int</span> j = get_global_id(0);</div>
<div class="line"><a name="l00030"></a><span class="lineno">   30</span>&#160;    float4 sum = (float4)0.0f;</div>
<div class="line"><a name="l00031"></a><span class="lineno">   31</span>&#160;    float4 matrixBColumn;</div>
<div class="line"><a name="l00032"></a><span class="lineno">   32</span>&#160;    <span class="comment">/* [Kernel size] */</span></div>
<div class="line"><a name="l00033"></a><span class="lineno">   33</span>&#160;</div>
<div class="line"><a name="l00034"></a><span class="lineno">   34</span>&#160;    <span class="comment">/* Move to a specific row in matrixA. */</span></div>
<div class="line"><a name="l00035"></a><span class="lineno">   35</span>&#160;    matrixA += i * matrixOrder;</div>
<div class="line"><a name="l00036"></a><span class="lineno">   36</span>&#160;</div>
<div class="line"><a name="l00037"></a><span class="lineno">   37</span>&#160;    <span class="comment">/* Move to a specific column in matrixB. */</span></div>
<div class="line"><a name="l00038"></a><span class="lineno">   38</span>&#160;    uint bOffset = j;</div>
<div class="line"><a name="l00039"></a><span class="lineno">   39</span>&#160;</div>
<div class="line"><a name="l00040"></a><span class="lineno">   40</span>&#160;    <span class="comment">/* [Load column] */</span></div>
<div class="line"><a name="l00041"></a><span class="lineno">   41</span>&#160;    <span class="comment">/*</span></div>
<div class="line"><a name="l00042"></a><span class="lineno">   42</span>&#160;<span class="comment">     * Load 4 values from a column of data from matrixB, and 4 values from a row in matrixA,</span></div>
<div class="line"><a name="l00043"></a><span class="lineno">   43</span>&#160;<span class="comment">     * then multiply them together. Repeat until all values in the column/row have been multiplied.</span></div>
<div class="line"><a name="l00044"></a><span class="lineno">   44</span>&#160;<span class="comment">     * We only want the sum of the calculation so we can add the result of each calculation to the last.</span></div>
<div class="line"><a name="l00045"></a><span class="lineno">   45</span>&#160;<span class="comment">     */</span></div>
<div class="line"><a name="l00046"></a><span class="lineno">   46</span>&#160;    <span class="keywordflow">for</span> (<span class="keywordtype">int</span> k = 0; k &lt; matrixOrder; k+=4)</div>
<div class="line"><a name="l00047"></a><span class="lineno">   47</span>&#160;    {</div>
<div class="line"><a name="l00048"></a><span class="lineno">   48</span>&#160;        matrixBColumn.x = matrixB[bOffset];</div>
<div class="line"><a name="l00049"></a><span class="lineno">   49</span>&#160;        bOffset += matrixOrder;</div>
<div class="line"><a name="l00050"></a><span class="lineno">   50</span>&#160;</div>
<div class="line"><a name="l00051"></a><span class="lineno">   51</span>&#160;        matrixBColumn.y = matrixB[bOffset];</div>
<div class="line"><a name="l00052"></a><span class="lineno">   52</span>&#160;        bOffset += matrixOrder;</div>
<div class="line"><a name="l00053"></a><span class="lineno">   53</span>&#160;</div>
<div class="line"><a name="l00054"></a><span class="lineno">   54</span>&#160;        matrixBColumn.z = matrixB[bOffset];</div>
<div class="line"><a name="l00055"></a><span class="lineno">   55</span>&#160;        bOffset += matrixOrder;</div>
<div class="line"><a name="l00056"></a><span class="lineno">   56</span>&#160;</div>
<div class="line"><a name="l00057"></a><span class="lineno">   57</span>&#160;        matrixBColumn.w = matrixB[bOffset];</div>
<div class="line"><a name="l00058"></a><span class="lineno">   58</span>&#160;        bOffset += matrixOrder;</div>
<div class="line"><a name="l00059"></a><span class="lineno">   59</span>&#160;        <span class="comment">/* [Load column] */</span></div>
<div class="line"><a name="l00060"></a><span class="lineno">   60</span>&#160;</div>
<div class="line"><a name="l00061"></a><span class="lineno">   61</span>&#160;        <span class="comment">/* [Calculation] */</span></div>
<div class="line"><a name="l00062"></a><span class="lineno">   62</span>&#160;        sum += vload4 (0, matrixA) * matrixBColumn;</div>
<div class="line"><a name="l00063"></a><span class="lineno">   63</span>&#160;        matrixA += 4;</div>
<div class="line"><a name="l00064"></a><span class="lineno">   64</span>&#160;    }</div>
<div class="line"><a name="l00065"></a><span class="lineno">   65</span>&#160;    <span class="comment">/* [Calculation] */</span></div>
<div class="line"><a name="l00066"></a><span class="lineno">   66</span>&#160;</div>
<div class="line"><a name="l00067"></a><span class="lineno">   67</span>&#160;    <span class="comment">/* [Store] */</span></div>
<div class="line"><a name="l00068"></a><span class="lineno">   68</span>&#160;    <span class="comment">/*</span></div>
<div class="line"><a name="l00069"></a><span class="lineno">   69</span>&#160;<span class="comment">     * Sum the 4 results to get the single output of multiplying a row of matrixA by a column of matrixB.</span></div>
<div class="line"><a name="l00070"></a><span class="lineno">   70</span>&#160;<span class="comment">     * Then carry out the final calculation.</span></div>
<div class="line"><a name="l00071"></a><span class="lineno">   71</span>&#160;<span class="comment">     */</span></div>
<div class="line"><a name="l00072"></a><span class="lineno">   72</span>&#160;    matrixC[i * matrixOrder + j] = alpha * (sum.x + sum.y + sum.z + sum.w) + beta * matrixC[i * matrixOrder + j];</div>
<div class="line"><a name="l00073"></a><span class="lineno">   73</span>&#160;    <span class="comment">/* [Store] */</span></div>
<div class="line"><a name="l00074"></a><span class="lineno">   74</span>&#160;}</div>
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